IOWA ACADEMY OF SCIENCES. 
229 
324. M. officinalis (L.) Lam. Yellow Sweet-clover. 
Infrequent; streets of Estherville. Adventive 
from Europe. 
Trifolium L. 
325. T. pratense L. Red Clover. Roadsides; escaped 
from cultivation. 
326. T. hybridum L. Alsike Clover. Rare; introduced 
along road northeast of Armstrong, 1885. 
327. T. repens L. White Clover. A very common 
escape from cultivation. 
PsORALEA L. 
328. P. argophylla Pursh. Very common on prairie 
slopes. Flowering freely, but rarely perfecting 
seed. 
329. P. esculenta Pursh. Pomme de Prairie. Frequent 
on high prairies. The large starchy roots were 
used as an article of food by the Indians, and by 
the French voyageurs. 
Amorpha L. 
330. A. fruticosa L. False Indigo. A common shrub 
on prairies and in open woods. 
331. A. nana Nutt. (A. micropliylla Pursh.) Frequent 
on prairies. A pretty little shrub, somewhat 
resembling box. 
332. A. canescens Pursh. Lead Plant. Shoestring. A 
very common little shrub on prairies and borders 
of woods. 
Iauhnistera Lam. 
333. K. Candida (Willd.) Ivuntze. ( Pctalostemon Candi- 
das Michx.) White Prairie Clover. Common. 
334. K. purpurea (Vent.) Mac M. (Petalostemon violaceus 
Michx.) Purple Prairie Clover. Very common 
on prairies. 
Robinia L. 
335. R. pseudacacia L. Locust Tree. Rare, escaped 
from cultivation. 
